Where Sunburst installs solar in South Carolina

What decides payback in South Carolina

Three numbers set the economics of a South Carolina system: what you pay per kilowatt-hour today, what your utility credits you for power you export, and the 25% state tax credit. The first two depend entirely on who serves your meter. The third is statewide and is the single largest reason South Carolina projects pencil more often than Georgia or Virginia ones.

The state credit is claimed on Form TC-38 against your South Carolina income tax. It is capped at $3,500 in any one tax year and at 50% of your annual state liability, with a ten-year carry-forward. In practice that means most residential systems are claimed across two or three returns rather than recovered in one. It is worth understanding that shape before you budget around it, because a credit spread over three years is not the same as cash at installation.

The federal picture changed. The 30% federal residential credit expired for systems placed in service on or after 1 January 2026, so any South Carolina quote that still subtracts it from your net cost is working from a stale model. We price without it and say so on the quote. If you see a proposal with a 30% federal line on it, that is the first thing to question.

Beyond the credit, qualifying residential systems of 20 kW or less are exempt from South Carolina property tax, so adding solar does not raise your assessment, and solar equipment is exempt from state sales tax. Neither is something you claim; both are already reflected in what you pay and what you owe.

Why your utility matters more than your panels

South Carolina is served by a mix of investor-owned utilities, electric cooperatives and the state-owned Santee Cooper, and they do not credit exported power on the same terms. A cooperative sets its own rate structure and export credit. That is why the city list on this page is grouped by provider: it is the axis that actually changes the answer.

The practical consequence is that a quote built on a statewide average is a quote built on a number that applies to nobody. Before we model anything we confirm which provider serves your specific meter, because in several of our markets the boundary runs between neighbourhoods rather than around them, and the same street can be split.

The second consequence is about self-consumption. Where an export credit is well below the retail rate, the value of a system shifts towards the power you use in your own house as you generate it, which changes the sensible system size and makes battery storage a genuine question rather than an upsell. Where export terms are strong, a larger array carries itself. We would rather have that conversation with your actual tariff in front of us.

Permits, interconnection and HOAs in South Carolina

Permitting is local. Authority sits with a city or county building department, and the requirements and turnaround differ across the markets we serve. We pull the permits and handle the interconnection application as part of the job, and the individual city pages linked below name the permitting authority for that market specifically rather than describing a generic process.

South Carolina has no solar access law, so an association’s own governing documents decide whether and where panels are allowed. Architectural review is common, especially in the Charleston-area and Lowcountry neighbourhoods where a good part of our work sits. We prepare the architectural-review packet as part of every install rather than leaving it with the homeowner.

Historic districts are their own category, and Charleston in particular has review requirements that shape where an array can go and sometimes whether it can go on a street-facing plane at all. That is a design constraint to work with early, not a paperwork problem to discover after a contract is signed.

What the process actually looks like

The first conversation is a bill review, not a site visit. We need twelve months of usage to size anything honestly, because a system sized off a summer peak is oversized for the year and a system sized off a mild month underperforms every August. If you can send a recent statement, most of the guesswork disappears before anyone comes out.

The survey covers roof age and structure, shading across the year rather than on the day we visit, your main panel and service capacity, and where the equipment can physically go. Roof age is the one that most often changes the plan: putting an array on a roof with a few years left means paying to remove and reinstall it later, and it is usually cheaper to re-roof first.

Permitting and interconnection run in parallel and are ours to handle. The permit is local and the interconnection application goes to your utility; the utility side is generally the slower of the two and the one with the least predictable timeline, because it depends on their queue rather than on anything we control.

Installation itself is typically one to three days for a residential system. Then the system sits complete but switched off until the utility grants permission to operate. That gap frustrates people, so we say it plainly up front: the panels on your roof are not earning anything until that approval lands.

How to check an installer before you sign

Ask who is actually on the roof. A large share of residential solar in the Southeast is sold by one company and installed by a subcontractor the homeowner never meets, which matters on the day something needs fixing. Our crews are our own, and the person who surveys your roof works for the same company as the person who warranties the penetrations.

Ask for the production estimate in kilowatt-hours, not in dollars saved. A dollar figure hides two assumptions: what your utility will pay you and how fast rates rise, and both are doing more work than the equipment. A production figure can be checked against your own bill.

Ask what happens if the answer is no. An installer who has never told a homeowner their roof is too shaded, too old, or too small to be worth it is either extraordinarily lucky in their leads or is not telling anyone. We put that in writing before anything is ordered, and we would rather lose the sale than sell a system that does not pay.

Finally, check that the company is licensed and insured in the state where the work happens, and that the warranty is written against a business with a physical address you could drive to. We operate out of a Daniel Island office, and the roof-penetration warranty is ours, not a manufacturer pass-through.

The rules that apply everywhere in South Carolina

State income tax credit

South Carolina offers a 25% state income tax credit on Form TC-38, capped at $3,500 in any one tax year and at 50% of your annual state liability, with a ten-year carry-forward.

Property tax

Qualifying residential systems of 20 kW or less are exempt from South Carolina property tax.

Sales tax

Solar equipment is exempt from South Carolina state sales tax.

Homeowner associations

South Carolina has no solar access law, so your HOA’s governing documents decide what is allowed. We read them first and prepare the architectural-review packet as part of every install.

Rates, caps and statutes change. These are the figures we hold as current, with the underlying sources named on our South Carolina incentives page. Confirm your own position with a tax professional before budgeting around any of them.